Adjective proterozoic has 1 sense
  1. proterozoic - formed in the later of two divisions of the Precambrian era; "proterozoic life forms"
    Antonym:
    middle (indirect, via late, early)
    Antonym: late (indirect, via early, middle)
,Noun proterozoic has 1 sense
  1. Proterozoic, Proterozoic eon, Proterozoic aeon - from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms
    --1 is a kind of eon, aeon
    --1 is a part of
     Precambrian, Precambrian eon, Precambrian aeon, Precambrian period
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